IPv6 Multicast Address Family Support for Multiprotocol BGP
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Information About IPv6 Multicast Address Family Support for Multiprotocol BGP
Multiprotocol BGP for the IPv6 Multicast Address Family
The multiprotocol BGP for the IPv6 multicast address family feature provides multicast BGP extensions for IPv6 and supports the same features and functionality as IPv4 BGP. IPv6 enhancements to multicast BGP include support for an IPv6 multicast address family and network layer reachability information (NLRI) and next hop (the next router in the path to the destination) attributes that use IPv6 addresses.
Multicast BGP is an enhanced BGP that allows the deployment of interdomain IPv6 multicast. Multiprotocol BGP carries routing information for multiple network layer protocol address families; for example, IPv6 address family and for IPv6 multicast routes. The IPv6 multicast address family contains routes used for RPF lookup by the IPv6 PIM protocol, and multicast BGP IPv6 provides for interdomain transport of the same. Users must use multiprotocol BGP for IPv6 multicast when using IPv6 multicast with BGP because the unicast BGP learned routes will not be used for IPv6 multicast.
Multicast BGP functionality is provided through a separate address family context. A subsequent address family identifier (SAFI) provides information about the type of the network layer reachability information that is carried in the attribute. Multiprotocol BGP unicast uses SAFI 1 messages, and multiprotocol BGP multicast uses SAFI 2 messages. SAFI 1 messages indicate that the routes are usable only for IP unicast, not IP multicast. Because of this functionality, BGP routes in the IPv6 unicast RIB must be ignored in the IPv6 multicast RPF lookup.
A separate BGP routing table is maintained to configure incongruent policies and topologies (for example, IPv6 unicast and multicast) by using IPv6 multicast RPF lookup. Multicast RPF lookup is very similar to the IP unicast route lookup.
No MRIB is associated with the IPv6 multicast BGP table. However, IPv6 multicast BGP operates on the unicast IPv6 RIB when needed. Multicast BGP does not insert or update routes into the IPv6 unicast RIB.
How to Implement IPv6 Multicast Address Family Support for Multiprotocol BGP
Configuring an IPv6 Peer Group to Perform Multicast BGP Routing
SUMMARY STEPS1.
enable
2.
configure
terminal
3.
router
bgp
as-number
4.
neighbor
peer-group-name
peer-group
5.
neighbor
{ip-address |
ipv6-address |
peer-group-name}
remote-as
as-number
6.
address-family
ipv6
[unicast |
multicast]
7.
neighbor
{ip-address |
peer-group-name |
ipv6-address}
activate
8.
neighbor
{ip-address |
ipv6-address}
peer-group
peer-group-name
DETAILED STEPS | Command or Action | Purpose |
---|
Step 1 |
enable
Example:
Device> enable
|
Enables privileged EXEC mode.
- Enter your password if prompted.
|
Step 2 |
configure
terminal
Example:
Device# configure terminal
|
Enters global configuration mode.
|
Step 3 |
router
bgp
as-number
Example:
Device(config)# router bgp 65000
|
Enters router configuration mode for the specified BGP routing process.
|
Step 4 |
neighbor
peer-group-name
peer-group
Example:
Device(config-router)# neighbor group1 peer-group
|
Creates a BGP peer group.
|
Step 5 |
neighbor
{ip-address |
ipv6-address |
peer-group-name}
remote-as
as-number
Example:
Device(config-router)# neighbor 2001:DB8:0:CC00::1 remote-as 64600
|
Adds the IPv6 address of the neighbor in the specified autonomous system to the IPv6 multicast BGP neighbor table of the local router.
- The
ipv6-address argument in the
neighbor
remote-as command must be in the form documented in RFC 2373 where the address is specified in hexadecimal using 16-bit values between colons.
|
Step 6 |
address-family
ipv6
[unicast |
multicast]
Example:
Device(config-router)# address-family ipv6 multicast
|
Specifies the IPv6 address family, and enters address family configuration mode.
- The
unicast keyword specifies the IPv6 unicast address family. By default, the router is placed in configuration mode for the IPv6 unicast address family if a keyword is not specified in the
address-family
ipv6 command.
- The
multicast keyword specifies IPv6 multicast address prefixes.
|
Step 7 |
neighbor
{ip-address |
peer-group-name |
ipv6-address}
activate
Example:
Device(config-router-af)# neighbor 2001:DB8:0:CC00::1 activate
|
Enables the neighbor to exchange prefixes for the specified family type with the neighbor and the local router.
- To avoid extra configuration steps for each neighbor, use the
neighbor
activate command with the
peer-group-name argument as an alternative in this step.
|
Step 8 |
neighbor
{ip-address |
ipv6-address}
peer-group
peer-group-name
Example:
Device(config-router-af)# neighbor 2001:DB8:0:CC00::1 peer-group group1
|
Assigns the IPv6 address of a BGP neighbor to a peer group.
|
Advertising Routes into IPv6 Multiprotocol BGP
By default, networks that are defined in router configuration mode using the
network command are injected into the IPv4 unicast database. To inject a network into another database, such as the IPv6 BGP database, you must define the network using the
network command in address family configuration mode for the other database, as shown for the IPv6 BGP database.
SUMMARY STEPS1.
enable
2.
configure
terminal
3.
router
bgp
as-number
4.
address-family
ipv6
[vrf
vrf-name] [unicast |
multicast |
vpnv6]
5.
network
{network-number [mask
network-mask] |
nsap-prefix} [route-map
map-tag]
6.
exit
DETAILED STEPS | Command or Action | Purpose |
---|
Step 1 |
enable
Example:
|
Enables privileged EXEC mode.
|
Step 2 |
configure
terminal
Example:
Device# configure terminal
|
Enters global configuration mode.
|
Step 3 |
router
bgp
as-number
Example:
Device(config)# router bgp 65000
|
Enters router configuration mode for the specified BGP routing process.
|
Step 4 |
address-family
ipv6
[vrf
vrf-name] [unicast |
multicast |
vpnv6]
Example:
Device(config-router)# address-family ipv6 unicast
|
Specifies the IPv6 address family, and enters address family configuration mode.
The
unicast keyword specifies the IPv6 unicast address family. By default, the device is placed in configuration mode for the IPv6 unicast address family if a keyword is not specified with the
address-family
ipv6 command.
The
multicast keyword specifies IPv6 multicast address prefixes.
|
Step 5 |
network
{network-number [mask
network-mask] |
nsap-prefix} [route-map
map-tag]
Example:
Device(config-router-af)# network 2001:DB8::/24
|
Advertises (injects) the specified prefix into the IPv6 BGP database (the routes must first be found in the IPv6 unicast routing table).
The prefix is injected into the database for the address family specified in the previous step.
Routes are tagged from the specified prefix as “local origin.”
The
ipv6-prefix argument in the
network command must be in the form documented in RFC 2373 where the address is specified in hexadecimal using 16-bit values between colons.
The
prefix-length argument is a decimal value that indicates how many of the high-order contiguous bits of the address comprise the prefix (the network portion of the address). A slash mark must precede the decimal value.
|
Step 6 |
exit
Example:
Device(config-router-af)# exit
|
Exits address family configuration mode, and returns the device to router configuration mode.
|
Redistributing Prefixes into
IPv6 Multiprotocol BGP
Redistribution is
the process of redistributing, or injecting, prefixes from one routing protocol
into another routing protocol. This task explains how to inject prefixes from a
routing protocol into IPv6 multiprotocol BGP. Specifically, prefixes that are
redistributed into IPv6 multiprotocol BGP using the
redistribute
router configuration command are injected into the IPv6 unicast database.
SUMMARY STEPS1.
enable
2.
configure
terminal
3.
router
bgp
as-number
4.
address-family
ipv6
[vrf
vrf-name]
[unicast |
multicast |
vpnv6]
5.
redistribute
bgp
[process-id]
[metric
metric-value]
[route-map
map-name]
[source-protocol-options]
6.
exit
DETAILED STEPS | Command or Action | Purpose |
---|
Step 1 |
enable
Example:
Device> enable
|
Enables
privileged EXEC mode.
- Enter your password if
prompted.
|
Step 2 |
configure
terminal
Example:
Device# configure terminal
|
Enters global
configuration mode.
|
Step 3 |
router
bgp
as-number
Example:
Device(config)# router bgp 65000
|
Enters router
configuration mode for the specified BGP routing process.
|
Step 4 |
address-family
ipv6
[vrf
vrf-name]
[unicast |
multicast |
vpnv6]
Example:
Device(config-router)# address-family ipv6
|
Specifies the
IPv6 address family, and enters address family configuration mode.
- The
unicast keyword
specifies the IPv6 unicast address family. By default, the device is placed in
configuration mode for the IPv6 unicast address family if a keyword is not
specified with the
address-family
ipv6 command.
- The
multicast
keyword specifies IPv6 multicast address prefixes.
|
Step 5 |
redistribute
bgp
[process-id]
[metric
metric-value]
[route-map
map-name]
[source-protocol-options]
Example:
Device(config-router-af)# redistribute bgp 64500 metric 5
|
Redistributes
IPv6 routes from one routing domain into another routing domain.
|
Step 6 |
exit
Example:
Device(config-router-af)# exit
|
Exits address
family configuration mode, and returns the device to router configuration mode.
- Repeat this step to exit
router configuration mode and return the device to global configuration mode.
|
Assigning a BGP Administrative Distance
 Caution |
Changing the administrative distance of BGP internal routes is not recommended. One problem that can occur is the accumulation of routing table inconsistencies, which can break routing.
|
SUMMARY STEPS1.
enable
2.
configure
terminal
3.
router
bgp
as-number
4.
address-family
ipv6
[unicast |
multicast}
5.
distance
bgp
external-distance
internal-distance
local-distance
DETAILED STEPS | Command or Action | Purpose |
---|
Step 1 |
enable
Example:
|
Enables privileged EXEC mode.
|
Step 2 |
configure
terminal
Example:
Device# configure terminal
|
Enters global configuration mode.
|
Step 3 |
router
bgp
as-number
Example:
Device(config)# router bgp 100
|
Enters router configuration mode for the specified routing process.
|
Step 4 |
address-family
ipv6
[unicast |
multicast}
Example:
Device(config-router)# address-family ipv6 multicast
|
Enters address family configuration mode for configuring routing sessions such as BGP that use standard IPv6 address prefixes.
|
Step 5 |
distance
bgp
external-distance
internal-distance
local-distance
Example:
Device(config-router)# distance bgp 20 20 200
|
Assigns a BGP administrative distance.
|
Generating Translate Updates for IPv6 Multicast BGP
The multicast BGP translate-update feature generally is used in a multicast BGP-capable router that peers with a customer site that has only a BGP-capable router; the customer site has not or cannot upgrade its router to a multicast BGP-capable image. Because the customer site cannot originate multicast BGP advertisements, the router with which it peers will translate the BGP prefixes into multicast BGP prefixes, which are used for multicast-source RPF lookup.
SUMMARY STEPS1.
enable
2.
configure
terminal
3.
router
bgp
as-number
4.
address-family
ipv6
[unicast |
multicast}
5.
neighbor
ipv6-address
translate-update
ipv6
multicast
[unicast]
DETAILED STEPS | Command or Action | Purpose |
---|
Step 1 |
enable
Example:
Device> enable
|
Enables privileged EXEC mode.
- Enter your password if prompted.
|
Step 2 |
configure
terminal
Example:
Device# configure terminal
|
Enters global configuration mode.
|
Step 3 |
router
bgp
as-number
Example:
Device(config)# router bgp 100
|
Enters router configuration mode for the specified routing process.
|
Step 4 |
address-family
ipv6
[unicast |
multicast}
Example:
Device(config-router)# address-family ipv6 multicast
|
Enters address family configuration mode for configuring routing sessions such as BGP that use standard IPv6 address prefixes.
|
Step 5 |
neighbor
ipv6-address
translate-update
ipv6
multicast
[unicast]
Example:
Device(config-router)# neighbor 2001:DB8:7000::2 translate-update ipv6 multicast
|
Generates multiprotocol IPv6 BGP updates that correspond to unicast IPv6 updates received from a peer.
|
Resetting IPv6 BGP Sessions
SUMMARY STEPS1.
enable
2.
clear
bgp
ipv6
{unicast |
multicast} {* |
autonomous-system-number |
ip-address |
ipv6-address |
peer-group
peer-group-name} [soft] [in |
out]
DETAILED STEPS | Command or Action | Purpose |
---|
Step 1 |
enable
Example:
Device> enable
|
Enables privileged EXEC mode.
- Enter your password if prompted.
|
Step 2 |
clear
bgp
ipv6
{unicast |
multicast} {* |
autonomous-system-number |
ip-address |
ipv6-address |
peer-group
peer-group-name} [soft] [in |
out]
Example:
Device# clear bgp ipv6 unicast peer-group marketing soft out
|
Resets IPv6 BGP sessions.
|
Clearing External BGP Peers
SUMMARY STEPS1.
enable
2.
clear
bgp
ipv6
{unicast |
multicast}
external [soft] [in |
out]
3.
clear
bgp
ipv6
{unicast |
multicast}
peer-group
name
DETAILED STEPS | Command or Action | Purpose |
---|
Step 1 |
enable
Example:
|
Enables privileged EXEC mode.
|
Step 2 |
clear
bgp
ipv6
{unicast |
multicast}
external [soft] [in |
out]
Example:
Device# clear bgp ipv6 unicast external soft in
|
Clears external IPv6 BGP peers.
|
Step 3 |
clear
bgp
ipv6
{unicast |
multicast}
peer-group
name
Example:
Device# clear bgp ipv6 unicast peer-group marketing
|
Clears all members of an IPv6 BGP peer group.
|
Clearing IPv6 BGP Route Dampening Information
SUMMARY STEPS1.
enable
2.
clear
bgp
ipv6
{unicast |
multicast}
dampening [ipv6-prefix/prefix-length]
DETAILED STEPS | Command or Action | Purpose |
---|
Step 1 |
enable
Example:
Device> enable
|
Enables privileged EXEC mode.
- Enter your password if prompted.
|
Step 2 |
clear
bgp
ipv6
{unicast |
multicast}
dampening [ipv6-prefix/prefix-length]
Example:
Device# clear bgp ipv6 unicast dampening 2001:DB8::/64
|
Clears IPv6 BGP route dampening information and unsuppresses the suppressed routes.
|
Clearing IPv6 BGP Flap Statistics
SUMMARY STEPS1.
enable
2.
clear
bgp
ipv6
{unicast |
multicast}
flap-statistics [ipv6-prefix/prefix-length |
regexp
regexp |
filter-list
list]
DETAILED STEPS | Command or Action | Purpose |
---|
Step 1 |
enable
Example:
Device> enable
|
Enables privileged EXEC mode.
- Enter your password if prompted.
|
Step 2 |
clear
bgp
ipv6
{unicast |
multicast}
flap-statistics [ipv6-prefix/prefix-length |
regexp
regexp |
filter-list
list]
Example:
Device# clear bgp ipv6 unicast flap-statistics filter-list 3
|
Clears IPv6 BGP flap statistics.
|
Configuration Examples for IPv6 Multicast Address Family Support for Multiprotocol BGP
Example: Configuring an IPv6 Multiprotocol BGP Peer Group
The following example configures the IPv6 multiprotocol BGP peer group named group1:
router bgp 65000
no bgp default ipv4-unicast
neighbor group1 peer-group
neighbor 2001:DB8:0:CC00::1 remote-as 64600
address-family ipv6 unicast
neighbor group1 activate
neighbor 2001:DB8:0:CC00::1 peer-group group1
Example: Advertising Routes into IPv6 Multiprotocol BGP
The following example injects the IPv6 network 2001:DB8::/24 into the IPv6 unicast database of the local device. (BGP checks that a route for the network exists in the IPv6 unicast database of the local device before advertising the network.)
router bgp 65000
no bgp default ipv4-unicast
address-family ipv6 unicast
network 2001:DB8::/24
Example: Redistributing Prefixes into IPv6 Multiprotocol BGP
The following example redistributes RIP routes into the IPv6 unicast database of the local device:
router bgp 64900
no bgp default ipv4-unicast
address-family ipv6 unicast
redistribute rip
Example: Generating Translate Updates for IPv6 Multicast BGP
The following example shows how to generate IPv6 multicast BGP updates that correspond to unicast IPv6 updates:
router bgp 64900
no bgp default ipv4-unicast
address-family ipv6 multicast
neighbor 2001:DB8:7000::2 translate-update ipv6 multicast
Additional References
MIBs
MIB
|
MIBs Link
|
—
|
To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL:
http://www.cisco.com/go/mibs
|
Technical Assistance
Description
|
Link
|
The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password.
|
http://www.cisco.com/cisco/web/support/index.html
|
Feature Information for IPv6 Multicast Address Family Support for Multiprotocol BGP
The following table
provides release information about the feature or features described in this
module. This table lists only the software release that introduced support for
a given feature in a given software release train. Unless noted otherwise,
subsequent releases of that software release train also support that feature.
Use Cisco Feature Navigator to find information about platform
support and Cisco software image support. To access Cisco Feature Navigator, go
to
.
An account on Cisco.com is not required.
Table 1 Feature Information for IPv6 Multicast Address Family Support for Multiprotocol BGPFeature Name
|
Releases
|
Feature Information
|
IPv6 Multicast Address Family Support for Multiprotocol BGP
|
12.0(26)S
12.2(25)S
12.2(25)SG
12.2(33)SRA
12.2(33)SXH
12.3(4)T
12.4
12.4(2)T
15.0(1)S
|
This feature provides multicast BGP extensions for IPv6 and supports the same features and functionality as IPv4 BGP.
|